matt ackland got a sneak peek inside. >> reporter: there are few places where can you go and not hear the sweet sound of construction. >> when i go to the mayor's meeting, people talk about the appearance of the city, the condition of the city. >> reporter: mayor gray and the media got a tour of one of the largest projects under way. the marriott hotel taking place next door to the convention center. >> the city said we need more meeting rooms to be competitive. >> reporter: the developer plans to deliver, 1200 rooms, a total of 10,000 square feet of meeting space and an underground tunnel that connects to the convention center. when if opens, it should employ about a thousand people. 51% of those jobs will go to district residents. when complete, this place is going to be absolutely massive. because of height restrictions here in the district, it can only go up 14 floors. so to find space, construction crews dug down over 100 feet.